The Heiress of the Ghostess (Akutagawa x OC)

"Fear death. Fear slaughter. Those who desire death have an equal desire to die."
"Have you started hiring writers for your villain monologues now?"
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Three Mafia dogs, Two criminal organisations and One teddy bear. These were the three things that brought down the life of paradise Matsumoto Sakura was living in.
After her parents die in a seemingly mysterious building crash, Sakura tries her hardest to not succumb to grief and live her life normally with her older brother Shigeru; but The Port Mafia has other plans.
Port Mafia Executive Dazai Osamu kidnaps Sakura and exposes her father's criminal past, leading Sakura to discover the true extent of her Special Ability.
When the Port Mafia forces her to join their ranks as Dazai's subordinate, she meets another one of the Mafia Dogs, Akutagawa Ryunosuke aka The Silent Rabid Dog........"More like The Silent Bastardly Prick" as Sakura would quote.
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TW⚠ Mentions of suicide (but y'all knew that), mentions of torture, major character death, gore, a lot of violence
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⚠⚠SPOILERS FOR THE ANIME⚠⚠ (but y'all knew that too)
Credits to the creation of Bungo Stray Dogs and its characters go to Kafka Asagiri